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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '06f41cec71c04a9557f9bcebd20673bca81347ca3d4443d9b4219d58abd1433e' 
  AND token = 'jXv3zI9LjO/XEMEswKXd3WFKtR7fHT+yoB60NrBjhl8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}